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After some testing on my own car (a '99), if you want the whole system to be off at startup, you have to run the temp control all the way down, one punch past 65 to Lo, then run the blower speed down to OFf. Turn off the engine and restart and it will start up with the temp on Lo and the fan OFf. At least mine does.
The minute you increase the fan speed or temp settings, (or set to AUTO) it will bollix up the works and it will not return to Lo/OFf unless you reset it that way before engine shutoff.
I agree with several others, the default operation seems to be to bring up the (hv)AC system at whatever the settings were when the engine was shut off.
If the engine was shut off with the AC in AUTO mode, it will come up in AUTO and self adjust the temp and blower settings to reach the preset temp.
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